5 replies to this topic

[Rick Anderson]

 I am currently rewiring my MOKE and have converted it to an electric fuel pump so I can fit an LCB. A lot of people recommend fitting an inertia switch or at least an oil pressure switch that will cut off the fuel pump in an accident or if the engine dies. Since they serve two different but related functions, I was wondering if anybody has fit both for redundancy? It would be easy to do - wire it using a four-pin relay with the ground wire in series passing through the inertia switch and then the oil-pressure switch with a momentary "primer" switch (to ground) wired between the inertia switch and the oil-pressure switch. Is this overkill? I had a bad rollover accident in my 1959 VW a few years ago so this is on my mind a lot.  

[timmy850]

If you need to fit one I’d just fit an inertia switch. You could tie the inertia switch into the fuel pump and ignition circuit

An oil pressure switch would mean it’d need to crank and get pressure prior to starting


A recent topic on this:
https://www.theminif...p/?fromsearch=1

[lsto]

I run an electric fuel pump and I just fitted an inertia switch. In my opinion the oil light switch would just be an added headache and in reality just make the car harder to start every day.
Good luck

[alpder]

The security of having both would be reassuring. Bypass the oil pressure switch by also temporarily feeding the fuel pump via the 'starter' position of the ignition switch (in much the same way the the resistor in some ballasted ignitions is bypassed during starting). That way you won't need to wait for oil pressure before the fuel starts pumping, and it'll be no different than having a mechy pump: fuel starts to flow as soon as the engine starts to crank.

[timmy850]

What very slim combination of events would need to happen for the oil pressure switch to be used and not the inertia switch?

It would have to be slow enough in speed that the inertia switch doesn’t trip, but then severe enough that the engine stops from either stalling or the ignition stopping

I can understand being a little cautious, but at the end of the day you’ve got to accept driving a moke comes with some inherent risks

My mk1 mini came from the factory with an electric pump, no fuses, relays or inertia switches (or even seatbelts). There’s only so much we can do to improve safety when driving on modern roads with SUV’s with bonnets taller than your roof

[Rick Anderson]

Thanks everybody. I will fit the inertia switch only since, as Timmy850 said, the combination of events in which both are needed would be very slim. Plus it may cause additional headaches.